Mahasihanadasutta 45.5

45.5

ekāhikampi āhāraṃ āhāremi, dvīhikampi āhāraṃ āhāremi …pe… sattāhikampi āhāraṃ āhāremi; iti evarūpaṃ addhamāsikampi pariyāyabhattabhojanānuyogamanuyutto viharāmi.

I ate once a day, once every second day, up to once a week, and so on, even up to once a fortnight. I lived committed to the practice of eating food at set intervals.